<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        //两者的最大区别：
        //mouseover 鼠标经过自身盒子会触发，经过子盒子还会触发
        //mouseenter 只会经过自身盒子触发  是因为mouseenter不会冒泡
        //mouseleave 鼠标离开，同样也不会有冒泡
        
    </script>
</body>
</html>